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INSTALLATION
Ceiling Suspension: Mount the unit in ceiling-
suspended horizontal orientation per suspen-
sion details (Figure 4a). Unit is NOT intended
to be wall mounted. Consult a qualified struc-
tural engineer for special mounting considera-
tions.
Install the unit so that it pitches slightly –(1/8
inch) – toward the condensate drain connec-
tion.
Condensate Drain
Install a trapped condensate drain line at unit
drain connection. All MMD units have 3/4 in.
FPT condensate main and auxiliary drain
WARNING
INSURE THAT THE UNIT IS ADE-
QUATELY
SUPPORTED
STRUCTURE TO PREVENT DAMAGE
OR INJURY CAUSED BY FALLING
EQUIPMENT! If uncertain about how
to connect to the structure, consult a
qualified structural engineer.
connections.
Provide adequate trap clearance (trap depth)
beneath the unit as indicated in Fig. 3. Pro-
vide freeze-up protection as required to in-
sure reliable condensate drainage. Freeze protec-
tion measures are customer-supplied and in-
stalled.
Pipe to condensate drain using PVC or copper or
other suitable material. Pitch drain piping down-
ward at a minimum slope of 1/8 inch per foot.
Pipe auxiliary drain to "tell tale" drain location or
floor drain to clearly indicate when condensate
drain service is required. Alternately, use a field-
provided condensate overflow detection device in
the auxiliary drain connection to provide alarm or
other controls action when the drain pan fills to the
level of the auxiliary drain.
Placing Unit In Ductwork
1. Utilize flexible transitions on supply and return
connections to reduce noise and vibration trans-
mission to the structure.
2. When the connecting return air duct is smaller
than the coil inlet opening, construct the transi-
tion piece so that the vertical and horizontal di-
mensions of the transition piece do not increase
more then one inch for every seven inches of
length of the transition piece.
3. Provide at least three feet of straight duct work
preceding the unit inlet.
035-000051-001
MAINTAIN THESE DIMENSIONS FOR ADEQUATE TRAP
SEAL:
A = 3.5" MINIMUM
B = 2.0" MINIMUM
NOTES:
1.
FROM
2.
3.
Duct Insulation and Vapor Proofing:
Properly select and install duct insulation as
required by the application.
All externally insulated duct work must have an
adequate vapor seal for summer operation. This
is particularly important where the duct is ex-
posed to highly humid conditions in such places
as attics, vented crawl spaces, unconditioned
basements, and utility rooms. The vapor seal
prevents condensation of moisture in the insu-
lating material and subsequent loss of its insu-
lating value.
Page 11 of 60
NOT TO SCALE
CONDENSATE DRAIN PIPING RECOMMENDATIONS:
A. MINIMUM 3/4" Φ PIPE SIZE
B. COPPER OR PVC PIPE MATERIAL
C. USE DIELECTRIC UNION FOR DISSIMILAR METALS.
D. INSULATE PER PROJECT SPECIFICATIONS.
PAD OR PLENUM HEIGHT AS REQUIRED TO INSTALL
TRAP AND CONDENSATE DRAIN PIPING.
AVOID BLOCKING FILTER SERVICE ACCESS WHEN
INSTALLING CONDENSATE DRAIN PIPING.
Fig. 3 — Condensate Drain
MMD IOM 1.2 11-10-2020
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